We report the preliminary modeling of archival Center for High Angular Resolution Astronomy (CHARA)/Visible spEctroGraph and polArimeter interferometric data of a K-giant star using the PHOENIX atmosphere code. We find that our preparatory model that includes only the chromospheric contribution closely reproduces the observed infrared Ca ii triplet line profiles of a test star: the K-giant, β Cet. This preliminary work requires the additional modeling of the wind contribution to improve the agreement with observations. We plan to perform a systematic study of K-giants chromospheric emission with multi-wavelength and multi-technique observations and modeling. Our plans include extending the modeling work to include the underlying wind component for a larger set of stars. Stellar Parameters and Images with a Cophased Array, the second-generation instrument at CHARA, will be the ideal instrument to perform such observations and reveal the chromospheric activity of K-giants.

我们使用 PHOENIX 大气代码报告了高角分辨率天文学中心 (CHARA)/可见光谱图和偏振计干涉测量数据的初步建模。我们发现，我们的预备模型仅包括色球贡献，非常接近地再现了观测到的测试星的红外 Ca  ii三重线轮廓：K 巨星，β 等。这项初步工作需要对风的贡献进行额外建模，以提高与观测的一致性。我们计划通过多波长和多技术的观测和建模对 K 巨星色球发射进行系统研究。我们的计划包括扩展建模工作，以包括更多恒星的潜在风分量。CHARA 的第二代仪器带有同相阵列的恒星参数和图像将是执行此类观测和揭示 K 巨星色球活动的理想仪器。